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/*
* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
using System;
using System.IO;
using System.Text;
/*
* A simple class for writing out bytes as hexadecimal constants or
* explicit expressions for the initializer of a C array of 'unsigned
* char'. It starts every line with a given number of tabs, and aims at
* keeping lines below a given threshold (each indentation tab counts as
* 8 characters). An explicit newline is inserted before the first
* element, and commas are used as separators.
*/
class BlobWriter {
TextWriter w;
int maxLineLen;
int indent;
int lineLen;
/*
* Create a new instance. 'maxLineLen' is in characters, and
* 'indent' is the number of tab characters at the start of
* each line.
*/
internal BlobWriter(TextWriter w, int maxLineLen, int indent)
{
this.w = w;
this.maxLineLen = maxLineLen;
this.indent = indent;
lineLen = -1;
}
void DoNL()
{
w.WriteLine();
for (int i = 0; i < indent; i ++) {
w.Write('\t');
}
lineLen = (indent << 3);
}
/*
* Append a new byte value; it will be converted to an hexadecimal
* constant in the output.
*/
internal void Append(byte b)
{
if (lineLen < 0) {
DoNL();
} else {
w.Write(',');
lineLen ++;
if ((lineLen + 5) > maxLineLen) {
DoNL();
} else {
w.Write(' ');
lineLen ++;
}
}
w.Write("0x{0:X2}", b);
lineLen += 4;
}
/*
* Append a C expression, which will be used as is. The expression
* may resolve to several bytes if it uses internal commas. The
* writer will try to honour the expected line length, but it
* won't insert a newline character inside the expression.
*/
internal void Append(string expr)
{
if (lineLen < 0) {
DoNL();
} else {
w.Write(',');
lineLen ++;
if ((lineLen + 1 + expr.Length) > maxLineLen) {
DoNL();
} else {
w.Write(' ');
lineLen ++;
}
}
w.Write("{0}", expr);
lineLen += expr.Length;
}
}
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